Key to the species of Bryopsis

1 Erect axes branched from all sides (polystichously, radially), appearing somewhat tufted; branchlets successively shorter toward apex, or without pattern and unsymmetrical B. hypnoides
1 Erect axes branched mostly from one or two (opposite) sides (distichously, pinnately), branchlets shorter toward apices, giving plumose, feathery appearance to axes B. pennata

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